Challenge the girls to build the strongest bridge
they can, using only popsicle sticks (or, for a more difficult task, try
pasta) and glue. The bridges must span a 1m space. To make the challenge
more interesting you can limit the amount of materials the girls have
available. The bridges must be completely dry before testing. During the
test, add the weights to the bridge one at a time, giving the bridge about
30 seconds between weights to see if it will still hold. The bridge which
holds the greatest weight before collapsing wins!